My favourite ever is X 1999. I also liked a lot Tokyo Babylon, i think it was
one of their best.
From the new ones I find really good Lawful Drug, xxxholic and Tsubasa. I didn't
like Tsubasa at first, but it gets a lot better after the first two
books.
The stories I liked less, Chobits and Angelic Layer. The art is nice (specially
in chobits) and the story is well done, but I find them too much done as
something to get fame and high sells.
I am addicted to Chobits. The story is so cute and also the drawings. Hm...Wish
and CSS are my second ones that I like. I'd never understand the story of
X-1999. Okay some details but it is too complicated for me to understand
everything.
i agree with ppl here. generally i appreciate all of clamp works.
from recent ones i can mention Tsubasa and xxxHolic. You know i read manga in
the original and in Tsubasa there's furigana while in xxxHolic there's no such
thing and it make the process of reading very slow. still on the point where i
am the plot looks very intriguing. so xxxHolic is highly recommended for
reading.
my fav series has to be X or Rayearth...
i think its the tragic element in both series that draws me,plue both are
beautifully drawn...
no really sure though...
I really love CLAMP *o*
Their stories are amazing, and their draw style too ^^
My favorite manga/anime are Tsubasa Reservoir Chronicle, Card Captor Sakura and
Chobits
My favourite would have to be X/1999 - Though Clamp does have some other good
ones in between. But "X" to me, has an excellent storyline unlike any
other from them :-)
X would definitely have to be the favourite, I just love the story, when will it
end though? The tv-series for it was pretty nice too, the movie was abit shabby.
For the recent series, TRC is nice, good to see favourite characters in several
series all in the one place; the anime didn't live up to the mange in most parts
but there were improvements and hopefully season 2 would be better. I've heard
good things about xxxHolic but havent read any of it for myself as of
yet...
For the not so recent ones, CCS was good, so was the anime (not CC, american
butchered version )
and Angelic Layer I liked the anime more I think, can't really remember now...
but I remember I liked the "final fight" in the anime more, it was
flashier and longer
cardcaptor sakura definitely.
I don´t like so much CLAMP, but X-1999 and CHOBITS are very good productions of this team.
read my name
I really love Tsubasa Chronicle, xxxholic, Legal Drug, and Clamp School Detectives. My goal in life is to collect every Clamp manga.
I definately thing that Card Captor Sakura and then Tsubasa Chronicles.
I love CLAMP. Great work.
I'm waiting to read/watch xxxHolic, magical knight rayearth, and x...just need to make more time
chobits was also great
I think CCS and Tsubasa are my favorites.
I also really like Wish and Suki and Legal Drug.
Clamp does 'cute' so very well!
hmmmm...i thas to be either X 1999 or Chobits....that's a toughie... they're just both so different...yet unique in their own way.
I like every Clamp serie They are all great.
My favourite ever is X 1999. I also liked a lot Tokyo Babylon, i think it was one of their best.
From the new ones I find really good Lawful Drug, xxxholic and Tsubasa. I didn't like Tsubasa at first, but it gets a lot better after the first two books.
The stories I liked less, Chobits and Angelic Layer. The art is nice (specially in chobits) and the story is well done, but I find them too much done as something to get fame and high sells.
i like Tsubasa Resevoir Chrnonicle, cause every chars is in there ^_^
i like X too, but it makes me old to wait for the ending
don't know bout XXX Holic, haven't seen it
I am addicted to Chobits. The story is so cute and also the drawings. Hm...Wish and CSS are my second ones that I like. I'd never understand the story of X-1999. Okay some details but it is too complicated for me to understand everything.
i agree with ppl here. generally i appreciate all of clamp works.
from recent ones i can mention Tsubasa and xxxHolic. You know i read manga in the original and in Tsubasa there's furigana while in xxxHolic there's no such thing and it make the process of reading very slow. still on the point where i am the plot looks very intriguing. so xxxHolic is highly recommended for reading.
I like X ,TB and CLOVER
although they are full of sadness,they are thought-provoking
Magic Knight Rayearth... I just love it!^^
chobits! cute, funny and normal relationship hehe
very rare to find in clamp works you know!
my fav series has to be X or Rayearth...
i think its the tragic element in both series that draws me,plue both are beautifully drawn...
no really sure though...
I really love CLAMP *o*
Their stories are amazing, and their draw style too ^^
My favorite manga/anime are Tsubasa Reservoir Chronicle, Card Captor Sakura and Chobits
Hmmm....I really don't have one favorite CLAMP series, I love them all. But if I did have to pick one, then it'd proabably be Tubasa or xxxHolic.
Shirahime Syo was very good for me, but I need to see some mnore of CLAMP, to be more accurate.
My favourite would have to be X/1999 - Though Clamp does have some other good ones in between. But "X" to me, has an excellent storyline unlike any other from them :-)
X would definitely have to be the favourite, I just love the story, when will it end though?
The tv-series for it was pretty nice too, the movie was abit shabby.
For the recent series, TRC is nice, good to see favourite characters in several series all in the one place; the anime didn't live up to the mange in most parts but there were improvements and hopefully season 2 would be better. I've heard good things about xxxHolic but havent read any of it for myself as of yet...
For the not so recent ones, CCS was good, so was the anime (not CC, american butchered version
)
and Angelic Layer I liked the anime more I think, can't really remember now...
but I remember I liked the "final fight" in the anime more, it was
flashier and longer 
I like Tsubasa Chronicle. It's artworks are awesome and of course, can see many characters from other CLAMP series
By far its got to be X the TV series, though I do also have a soft spot for Card Captor Sakura as well.
i would say tsubasa chronicle and x/1999